# CardioEngine vs Zone2 Autopilot

The clearest difference is in-app purchases: Zone2 Autopilot at none against CardioEngine's 1. Zone2 Autopilot also leads on iOS requirement (17.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CardioEngine sells 1 one-off in-app purchase. Zone2 Autopilot asks for nothing beyond the download.

CardioEngine ships an update every 9 days, Zone2 Autopilot every 8 days. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CardioEngine | Zone2 Autopilot |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 8 days** |
| Size | 9 MB | 10 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Feeling Mindful Labs LLC](https://appshunter.io/developer/1716689922) | [Brad Richardson](https://appshunter.io/developer/6780289466) |

## What reviewers say

### CardioEngine

[App page](https://appshunter.io/ios/app/cardioengine-hr-zone-training/id6761030036)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CardioEngine Full Access | $29.99 | one-time |


### Zone2 Autopilot

[App page](https://appshunter.io/ios/app/zone2-autopilot/id6780289464)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CardioEngine free?

CardioEngine is free to download, with in-app purchases available.

### Is Zone2 Autopilot free?

Zone2 Autopilot is free to download, with no in-app purchases.

### Do CardioEngine or Zone2 Autopilot have ads?

Neither CardioEngine nor Zone2 Autopilot shows ads.

### Which is updated more often, CardioEngine or Zone2 Autopilot?

CardioEngine ships an update every 9 days, and Zone2 Autopilot every 8 days. Most recently, CardioEngine was updated on October 19, 2026 and Zone2 Autopilot on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*